Make Poll handle stoppable and startable

Author: lolgab

client/curl.scala

@@ -198,7 +198,7 @@ object Curl {
         }
       } else {
         println("stopping poll")
-        pollHandle.stop()
+        pollHandle.close()
         startTimerCB(multi, 1, null)
       }
       0

core/src/main/scala/scala/scalanative/loop/Poll.scala

@@ -18,6 +18,10 @@ import internals.HandleUtils
 
   def stop(): Unit = {
     uv_poll_stop(ptr)
+  }
+
+  def close(): Unit = {
+    stop()
     HandleUtils.close(ptr)
   }
 }